@article{ELMA_1979__34_141233,
     author = {Ernst Ungeth\"um},
     title = {Ponceletsche {Dreieckscharen.}},
     journal = {Elemente der Mathematik},
     pages = {109--119},
     publisher = {mathdoc},
     volume = {34},
     year = {1979},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1979__34_141233/}
}